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(.module:
[lux #*
data/text/format
["_" test (#+ Test)]
[abstract/monad (#+ do)]
[math
["r" random (#+ Random)]]
[control
["." function]]]
{1
["." / (#+ Monoid)
[//
[equivalence (#+ Equivalence)]]]})
(def: #export (spec (^open "/@.") (^open "/@.") gen-sample)
(All [a] (-> (Equivalence a) (Monoid a) (Random a) Test))
(do r.monad
[sample gen-sample]
(<| (_.context (%name (name-of /.Monoid)))
($_ _.and
(_.test "Left identity."
(/@= sample (/@compose /@identity sample)))
(_.test "Right identity."
(/@= sample (/@compose sample /@identity)))
))))
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